Those who mimic sport said to be funny? (9)
I believe the answer is:
parodists
'those who mimic' is the definition.
(parody is a sort of mimicry)
'sport said to be funny?' is the wordplay.
'to be funny?' indicates an anagram (I've seen 'funny' mean this).
'sport'+'said'='sportsaid'
'sportsaid' is an anagram of 'PARODISTS'.
(Other definitions for parodists that I've seen before include "They take off" , "They mock" .)